Re: [U-Boot] Performance problems with gunzip

2010-01-25 Thread A. Geisreiter
prüngliche Nachricht- Von: Detlev Zundel [mailto:d...@denx.de] Gesendet: Freitag, 22. Januar 2010 16:20 An: A. Geisreiter Cc: u-boot@lists.denx.de Betreff: Re: AW: [U-Boot] Performance problems with gunzip Hi Andreas, > thanks for the fast response. How do I enable data caches? I fear t

Re: [U-Boot] Performance problems with gunzip

2010-01-22 Thread Alessandro Rubini
> I never said it was difficult, only non-trivial :) Not trivial, actually. > I am looking forward to something like this for a long time now and I'm > sure other people will value it too, so thanks in advance! It's still not working, but _I_ am working on it again after the weekend. /alessandr

Re: [U-Boot] Performance problems with gunzip

2010-01-22 Thread Detlev Zundel
Hi Alessandro, >> I fear this is not as easy as flipping a bit in a register. Depending >> on the platform caches tend to be tied to the MMU, so enabling the >> caches require setting up correct data structures for the MMU to work. >> That's the non-trivial work. > > Not that difficult, either.

Re: [U-Boot] Performance problems with gunzip

2010-01-22 Thread Alessandro Rubini
> I fear this is not as easy as flipping a bit in a register. Depending > on the platform caches tend to be tied to the MMU, so enabling the > caches require setting up correct data structures for the MMU to work. > That's the non-trivial work. Not that difficult, either. You just need to fill th

Re: [U-Boot] Performance problems with gunzip

2010-01-22 Thread Detlev Zundel
Hi Andreas, > thanks for the fast response. How do I enable data caches? I fear this is not as easy as flipping a bit in a register. Depending on the platform caches tend to be tied to the MMU, so enabling the caches require setting up correct data structures for the MMU to work. That's the non

Re: [U-Boot] Performance problems with gunzip

2010-01-22 Thread A. Geisreiter
Hi Detlev, thanks for the fast response. How do I enable data caches? Regards, Andreas -Ursprüngliche Nachricht- Von: Detlev Zundel [mailto:d...@denx.de] Gesendet: Freitag, 22. Januar 2010 15:45 An: A. Geisreiter Cc: u-boot@lists.denx.de Betreff: Re: [U-Boot] Performance problems with

Re: [U-Boot] Performance problems with gunzip

2010-01-22 Thread Detlev Zundel
Hi Andreas, > I try to unzip a WinCE kernel with the U-Boot gunzip routine. It is working, > but it takes roughly 1min to uncompress a 10MB zip file. > I am working with a PXA270 platform. What could be the reason for the worst > performance? Very likely the disabled instruction and data caches

[U-Boot] Performance problems with gunzip

2010-01-22 Thread A. Geisreiter
Hello, I try to unzip a WinCE kernel with the U-Boot gunzip routine. It is working, but it takes roughly 1min to uncompress a 10MB zip file. I am working with a PXA270 platform. What could be the reason for the worst performance? Thanks, Andreas ___